Not to hijack this thread-- but the X1's switch, because of the small size of the rubber dome over the "switch" (actually a plunger that moves the (-) contact plate and forces it to contact the bare end of the flashlight tube), tends to be a little stiff at first. The X5 and X0, X03, etc., with the same style switch don't suffer from this problem because the dome is much larger and gives you more area to press.
Some of the early 2nd gen X1s seemed to have excess tailcap play which made this whole scheme even sloppier. Also, there are occasionally problems with a bit of HA on the end of the battery tube that needs to be cleaned up to ensure good contact between the contact plate and the tube.
I bought one of the first 2nd gen X1s when they were available and found that the switch was excessively stiff. I've EDCd it for several months now and it has really broken in and lost all of its original stiffness. I regularly use it in intermittent mode now.
ObDorcy: I sold one nice white Super 1 Watt because I thought it was kind of cheaply built (and didn't like the fact that the LED is completely thermally insulated). Afterwards, I missed the excellent tint of the RXOH star, and bought another. After a few days, the tailcap started consistently loosening up. I kept snugging it, and it soon stripped out. It basically rattled around right up until it was extremely snug on the body- even worse than the first one, so they definitely have some loose production tolerances.
I ended up returning the thing, as I would consider it to be defective to have lasted less than a week.
With the dorcy, you're paying for a nice $2.00+ Luxeon star; for the Inova it's for their engineering and QC, not for the $.10 Nichia.